9m-21=8m-7

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Solution for 9m-21=8m-7 equation: 



9m-21=8m-7

We move all terms to the left:

9m-21-(8m-7)=0

We get rid of parentheses

9m-8m+7-21=0

We add all the numbers together, and all the variables

m-14=0

We move all terms containing m to the left, all other terms to the right

m=14

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